Air or gas preheating device for furnaces and the like.



v W. B. MoLUSKY. AIR. 0R GAS PREHEATING DEVICE FOR FURNACES AND THE LIKE.

APPLICATION FILED FEB. 13, 1909.

925,215. Patented June 15, 1909.

o 3 SHEETS-SHEET 1.

' W. B. MoLUSKY.

AIR 0R GAS PREHEATING DEVICE FOR FURNACES AND THE LIKE.

APPLIOATION FILED FEB.13, 1909. 925,21 5

Patented June 15, 1909.

3 SHEETS-SHEET 2 diama- W. B. MoLUSKY. AIR 0R GAS PREHEATING DEVICE FOR FURNAGES'AND THE LIKE.

APPLIOATION FILED FEB.13, 1909.

Patented June 15, 1909.

3 SHEETSSHEET 3.

' face of the main setting.

- UNITED STATES PATENT oFFro WILLIAM BOUVARD McLUSKY, OF PERTH, SCOTLAND.

AIR OR GAS PREHEATING DEVICE FOR FURNACES AND THE LIKE. 7

Specification of Letters Patent.

Patented June 15, 1909.

Application filed February 13, 1909. semi No. 477,791.

To all whom it may concern:

Be it known that 'I, VWLLIAM Bonvmm Melmsur, a subject of the King of Great Britain and,'lreland, and residing at The Gas Works, Perth, Scotland, have invented certain new and useful Improvements in and Relating to Air or Gas lreheating Devices for Furnaces and the Like, of which the following is a s iiecification.

This invention relates to-air or gas preheating arrangemmits for utilizing the heat of the waste gases of furnaces, ovens and the like and has for its object to provide an improved air or gas heating device Which shall be easily accessible in all its parts and adapted to be readily incorporated in the furnace or the like in such a manner as to be relieved of all structural stresses due to weight and in which a large air or gas heat ing surface is alForded in a compact form.

The invention-consists in an air or gas heating device comprising one or a plurality of hollow narrow vertical elements arranged to be heated externally by Waste, furnace or oven gases and constructed of refractory material or metal and provided with inlet, outlet and inspection openings, the air or gas to be heated passing when more than one element is used in parallel or in series through'the elements. W The invention also consists in the im proved air or gas heating device, hereinafter indicated. Referring now to the accompanying d rawings which form part of the specification; Figures 1, 2 and 4 show a sectional elevation and two side views of a gas or air'heatin g' device according to the present invention, while Fig. 3 is a side sectional elevation on the lines A-A of Fig. 1. Fig. 5 is a sectional plan on the line B-B of Fig. 1.

Figs. 6 and 7 illustrate a modification inwhich the device is built up of separate pieces. Fig. 8 is apart sectional side view showing the device applied to -a settin the lower part of which projects beyon the .Fig. 9 is a part sectional side view showing the device applied to a setting flush with-the main setting, and Fig. 10 is a part sectional front elevation of Fig. 9. Fig.11 is a lan showing two sets of the heating devlces in po-,

sition.

-Tn carrying this inventlon into eifectjaccording to one construction, I provide nar-' row hollowelements, a, constructed of rei fractory material or metal. These elements breadth and are formed wlth their walls as strength. The elements, a, are adapted to stand upright, that is, with their longest sides vertical. On one of the long narrow vertical sides the elements, a, are dented in for a considerable portion of their width, say for instance, at three points, as shown at Fig. 1.- The portions of the side between these indentations are formed as openings, 0 (IL-which in the case of three indentations, will hc'iour in number. The lowermost o these openings, 0 actsas an inlet for the air or gas to be heated and the other three openings, 0 c c, act as inspection holes; of course the inlet aperture, (I, also may be used as an inspection opening. Upon the OPPQSltQVQT- tieal side of the element, a, and at lts upper end is provided a projectin POIUOIII, e, having a passage, f, passing t rough 1t. The dented in parts, 7), before referred. to are arrangedso as to afford supportin means between the two fiat wide vertical sides, 9 g, of the elements.

In a further modification according to Figs. 6 and 7 thev hollow elements are constructed of a number of parts which are arranged to fit together with a spigot and socket arrangement. This form of the device is particularly applicable when the elements are constructed offire clay as itenclay elements to be effected with greater ease.

Figs. 6 and 7 also illustrate the employings. Of course this sectional construction of element may be appliedto the case when mast iron is used. 3

fired retort furnace, one or a plurality of the hollow elements, a, are arranged vertically in the flue or duct conveying the waste gases from the'furnace to the chimney. The eleg g, adjacent to one another inspection and inlet apertures, 0 (Z, ad] acent to one of the side walls, h, of the furnace or other structure and are built into this wall in such a manner that the inlet andm- 'spection openings are readily accesnble from the outside. "The incorporat1on of the a erture side of these elements, a, with the side wall, k, of the furnace structure 1s efthin as possible consistent with the requisite ables the molding and firing ofthe fire ments are arranged with their broad sides. I and with the.

are relatively long as com ared with their ment of five instead of four inspection open- I In app ying this improved device to a gas fected in such a manner'that the elements faces of the elements and their rectangular outline, their setting and the incorporation of their aperture sides with the furnace side can be effected with ordinary stock bricks and without the need for specially shaped bricks.

All the inspection apertures, 0, except the lowest one, (Z, which is also the inlet aperture, are provided with. plugs, j, of any suitable material and form so arrangedthat they may be readily removed for purposes of inspection.

The air or gas to be heated is passed into the inside of each tube through its lowest inspection aperture, d, and after passing through the element escapes by the aperture, f, near the top of the element on the side opposite to the inspection apertures. The air or gas'on leaving this outlet, f, passes into a separate duct or channel, is, in the solid wall of the furnace between the gas producer and the main pier of the arch (when a gas producer is used) and thence by channels, Z, spaced off in the packing of the producer arch, n, direct to the combustion chamber where it meets the gases issuing from the producer."

From the foregoing it will be understood that each separate supply of air after passing through the element and absorbin the 'heat transmitted to its walls by the waste heat of the furnace gases is kept separate and away from the air passing through the adjacent elements. Owing to this feature it is possible-in the event of damage to any one of the elements to shut it off by plugging its inlet aperture, d, and thus the furnace may continue in operation until a suitable occasion occurs for repairing the damaged element.

The elements, a, may be used separately or in batteries and may in some cases be arrangedin series with each other the-con-- tents of one element passing through as many other elements as may be required all such elements being connected to one of the ducts, K. When used in batteries the elements are so arran ed that the waste heat envelops or surroun s them on the three exposed sides. I

It will be seen that a great advantage of the invention is its accessibility, any and every part of the elements being accessible from the front for inspection or repair without interruption of the working ofthe fur- The invention is applicable to furnaces generally and particularly to retort furnaces employed to heat gas or other retorts, m,

built vertically, horizontally or at any angle,

in the figures the retorts are shown horizontal. Further the improved device can be fitted to old settings without disturbing the existing retorts.

By the invention what is known as short circuiting or cross cutting, that is leakage of air to the gas flue is effectually overcome and the predetermined quantity of airadmitted at the inlet of each tube is delivered at the combustion chamber with absolute certainty.

2. An air or gas preheating device comprising a hollow narrow vertical element having in one side thereof inspection openings one of which acts as an inlet opening, and an outlet opening in the side opposite to the inspection openings.

3. An air or gas preheating device comprising a hollow narrow vertical element having on one narrow side inlet and inspection openings and an outlet, opening on the opposite narrow side, indentations between the openings acting as supporting means between the wide sides of the element, said element being divided between the openings into a plurality of portions, these portions being socketed together.

4. An air or gas preheating "device comprising a hollow narrow vertical element having in one side thereof inspection openings, one of which acts as an inlet opening, and an outlet opening in the side opposite to the inspection openings, said element being constructed in a plurality of portions socketed together.

5. A heating furnace comprising a heating flue a wall therefor, an air or gas preheating device comprising a hollow narrow I vertical element having air inlet and outlet openings and inspection means, said element being built into the wall and projecting into the flue. v

6. A heating furnace comprising a heating flue, a wall therefor, an air or gas preheating device comprising a hollow narrow vertical element having air inlet and outlet openings and inspection means, said element being built into the wall and projecting into the flue, and a duct leading hot air from the outlet of said preheating element.

7. A heating furnace comprising a heating flue; a walltherefor; a plurality of air or gas preheating devices, each comprising a hollow narrow vertical element having air inlet and outlet openings and inspection means; a plurality of ducts for said preheating devices, said ducts opening to various points in the heating furnace.

8. A heating furnace comprising a heating flue; a wall therefor; a plurality of air or gas preheating devices built into said Wall and extending into the heating flue, said preheating devices each compr1sing a hollow narrow vertical element having air inletand out-let openings and inspection means; all of said preheating devices being in parallel; a plurality of ducts-one for each preheating device-and channels acting to lead heated air from said ducts to the point. of combustion.

In testimony whereof, I afiix my signature in presence of two witnesses.

WILLIAM BOUVARD MOLUSKY. Witnesses:

THOMAS MCLAGAN Mom, ANDREW ROBIN WILSON. 

